Logitec Kanji tablet

Modern systems for inputting Japanese text use some kind of
context-sensitive recognition of phonetic input. (See Ken Lunde's CJKV for more
information.) But these require fairly sophisticated linguistic
models and lots of CPU power. In the early days, more brute force
approaches were tried, such as this giant "keyboard" meant to be used
with a stylus to input kanji one at a time. The "keys" are about .5cm
square and the table overall is the about same size as tablets still
used for CAD and other design tasks.

Input via this tablet really was supported by the Japanese version of
the Symbolics system.